242221021 has 16 divisors (see below), whose sum is σ = 293040000. Its totient is φ = 195789888.

The previous prime is 242220991. The next prime is 242221051. The reversal of 242221021 is 120122242.

It is an interprime number because it is at equal distance from previous prime (242220991) and next prime (242221051).

It is not a de Polignac number, because 242221021 - 2⁷ = 242220893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242220986 and 242221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5146 + ... + 22603.

It is an arithmetic number, because the mean of its divisors is an integer number (18315000).

Almost surely, 2^242221021 is an apocalyptic number.

It is an amenable number.

242221021 is a deficient number, since it is larger than the sum of its proper divisors (50818979).

242221021 is a wasteful number, since it uses less digits than its factorization.

242221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27828.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 242221021 is about 15563.4514488272. The cubic root of 242221021 is about 623.3576258719.

Adding to 242221021 its reverse (120122242), we get a palindrome (362343263).

The spelling of 242221021 in words is "two hundred forty-two million, two hundred twenty-one thousand, twenty-one".